trimmomatic: fix build by switching to JDK 21

For some reason, the invocation of jre_minimal in conjunction with
JDK 11 leads to failures; `jlink` complains about a version mismatch
with the target JRE version:

```
Running phase: patchPhase
Running phase: updateAutotoolsGnuConfigScriptsPhase
Running phase: configurePhase
no configure script, doing nothing
Running phase: buildPhase
Error: jlink version 21.0 does not match target java.base version 11.0
```

I didn't invest much time into figuring out how this happens, because
simply switching to JDK 21 seems to do at least fix the failing build.

pkgs/top-level/all-packages.nix

@@ -15635,14 +15635,14 @@ with pkgs;
     ;
 
   trimmomatic = callPackage ../applications/science/biology/trimmomatic {
-    jdk = pkgs.jdk11_headless;
+    jdk = pkgs.jdk21_headless;
     # Reduce closure size
     jre = pkgs.jre_minimal.override {
       modules = [
         "java.base"
         "java.logging"
       ];
-      jdk = pkgs.jdk11_headless;
+      jdk = pkgs.jdk21_headless;
     };
   };